Fix the MIPS build.
Fix the MIPS build.

Use an override for the dex2oat Xmx value when cross-compiling.
Bug: 16221224

Change-Id: Iaeac95cd50a0bae7817ee7da23b3cf25246f1d6d

xorware/android_build,xorware/android_build,xorware/android_build,xorware/android_build,xorware/android_build